Effect of Osmotic Concentration on Auxin-action and on Irreversible and Reversible Expansion of the Avena Coleoptile-猫眼课题宝

渗透浓度对生长素作用以及燕麦胚芽鞘不可逆和可逆扩张的影响

DOI：

10.1111/j.1399-3054.1959.tb08915.x

发表时间：

1959

期刊：

影响因子：

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通讯作者：

中科院分区：

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文献类型：

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作者：

R. Cleland

生长素诱导的细胞壁松动取决于外源溶液的渗透浓度。当OPe大于某个临界值时，组织对生长素不敏感。如果OPe低于临界值，生长素引起的塑性拉伸就会发生。如果OPe超过临界值，组织再次变得生长素不敏感。临界值（0.1 ~ 0.15 M甘露醇）与等渗值无明显关系，其位置不受生长素浓度的影响。低OPe区域的塑性拉伸速率与OPe成正比。比例常数取决于生长素的浓度。2. 在生长素存在和不存在的情况下，弹性拉伸- ope曲线都有一个临界点。在高OPe条件下，弹性低且生长素不敏感，而在低OPe条件下，弹性高且生长素敏感。3. 不可逆伸长率的迅速增加导致ES的增加。ES增加的幅度取决于生长素的浓度，而不是IE的速度。4. 当IE受到高OPe的限制时，会有生长素不敏感的ES转换为IE。5. 只有当膨胀压力超过某个临界值时，生长素才会导致叶avena胚囊壁压力的降低。

Auxin-induced cell wall loosening is dependent upon the osmotic concentration of the external solution. The tissues are auxin-insensitive whenever OPe is greater than some critical value. If OPe is lowered below the critical value, auxin-induced plastic stretching occurs. The tissue again becomes auxin-insensitive If OPe exceeds the critical value. The critical value (0.1-0.15 M mannitol) bears no apparent relation to the isotonic value, and its position is unaffected by the auxin concentration. The rate of plastic stretching in the region of low OPe is proportional to OPe. The proportionality constant is dependent upon the auxin concentration. 2. The elastic stretching-OPe curve shows a critical point both in the presence and absence of auxin. Under conditions of high OPe, elasticity is low and auxin-insensitive, while with low OPe, elasticity is higher and is auxin-sensitive. 3. A rapid increase in irreversible elongation causes a concomitant increase in ES. The magnitude of the increase in ES is dependent upon the concentration of auxin rather than the rapidity of IE. 4. When IE is limited by a high OPe, there is an auxin-insensitive conversion of ES into IE. 5. Auxin causes a reduction in wall pressure in Avena coleoptiles only when turgor pressure exceeds some critical value.